FileUtils.chmod"u=wrx,go=rx",'somecommand'FileUtils.chmod"u=wr,go=rr",%w(my.rb your.rb his.rb her.rb)FileUtils.chmod"u=wrx,go=rx",'/usr/bin/ruby',:verbose=>true"a"isuser,group,othermask."u"isuser's mask.
"g" is group'smask."o"isother's mask.
"w" is write permission.
"r" is read permission.
"x" is execute permission.
"s" is uid, gid.
"t" is sticky bit.
"+" is added to a class given the specified mode.
"-" Is removed from a given class given mode.
"=" Is the exact nature of the class will be given a specified mode.